diff --git a/README.md b/README.md
index fdd9f26..4d26f4e 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,7 @@ Example:
     go get github.com/icza/gowut/gwu
     go get github.com/udhos/lockfile
     go get github.com/udhos/equalfile
+    go get github.com/udhos/difflib
     go get gopkg.in/yaml.v2
     go get golang.org/x/crypto/ssh
     go get github.com/aws/aws-sdk-go
diff --git a/jazigo/ui_test.go b/jazigo/ui_test.go
new file mode 100644
index 0000000..3f4ca4e
--- /dev/null
+++ b/jazigo/ui_test.go
@@ -0,0 +1,28 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestSplitBufLines(t *testing.T) {
+	split(t, "", 0)
+	split(t, "x", 1)
+	split(t, "\n", 1)
+	split(t, "x\n", 1)
+	split(t, "\nx", 2)
+	split(t, "x\nx", 2)
+	split(t, "\n\n", 2)
+	split(t, "x\n\n", 2)
+	split(t, "\nx\n", 2)
+	split(t, "\n\nx", 3)
+	split(t, "\n\nx\n", 3)
+	split(t, "\n\n\n", 3)
+}
+
+func split(t *testing.T, input string, wantLineCount int) {
+	result := splitBufLines([]byte(input))
+	count := len(result)
+	if count != wantLineCount {
+		t.Errorf("splitBufLines: input=%v expected=%d got=%d", input, wantLineCount, count)
+	}
+}